1135550981 has 2 divisors, whose sum is σ = 1135550982. Its totient is φ = 1135550980.

The previous prime is 1135550957. The next prime is 1135551007. The reversal of 1135550981 is 1890555311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1117564900 + 17986081 = 33430^2 + 4241^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1135550981 is a prime.

It is a super-2 number, since 2×1135550981² = 2578952060900124722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1135550081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 567775490 + 567775491.

It is an arithmetic number, because the mean of its divisors is an integer number (567775491).

Almost surely, 2^1135550981 is an apocalyptic number.

It is an amenable number.

1135550981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1135550981 is an equidigital number, since it uses as much as digits as its factorization.

1135550981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27000, while the sum is 38.

The square root of 1135550981 is about 33697.9373404367. The cubic root of 1135550981 is about 1043.2831958700.

The spelling of 1135550981 in words is "one billion, one hundred thirty-five million, five hundred fifty thousand, nine hundred eighty-one".